Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Perchloroethylene (Tetrachloroethylene) Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for Perchloroethylene provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), aqueous solubility, and density. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Color (APHA), Residue after Evaporation, Water, and Ultraviolet Spectrophotometry.
Cl2C:CCl2
Formula Wt 165.85
CAS No. 127-18-4
Note: Perchloroethylene usually contains a stabilizer. If a stabilizer is present, its identity and quantity must be stated on the label.
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . . Density . . . . . . . . . . . . . . . .
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clear liquid with a characteristic odor solvent boiling point, 121 °C insoluble 1.62
SPECIFICATIONS General Use Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.0% C2Cl4 Maximum Allowable Color (APHA) . . . . . . . . . . . . . . . . . . . . . . 10
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4259 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Residue after evaporation . . . . . . . . . . . . . . 5 ppm Water (H2O) . . . . . . . . . . . . . . . . . . . . . . . 0.05%
Specific Use Ultraviolet Spectrophotometry Wavelength (nm) 400 . . . . . . . . . . . . . . . . . . . 350 . . . . . . . . . . . . . . . . . . . 305 . . . . . . . . . . . . . . . . . . . 300 . . . . . . . . . . . . . . . . . . .
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Absorbance (AU) . 0.03 . 0.05 . 0.2 . 1.0
TESTS Assay Analyze the sample by gas chromatography using the general parameters cited in [Part 2: Chromatography; Recommended Procedures; Gas Chromatography]. The following specific conditions are also required. Column . . . . . . . . . . . . . . . . . . . . . . . . . . Type I, methyl silicone Measure the area under all the peaks, and calculate the perchloroethylene content in area percent. Correct for water content. The assay value is the combination of perchloroethylene and added stabilizers.
Color (APHA) [Part 2: Measurement of Physical Properties; Color (APHA); Procedure for Color (APHA)].
Residue after Evaporation [Part 2: Gravimetric Methods; Residue after Evaporation]. Evaporate 124 mL (200 g) to dryness in a tared, preconditioned dish on a hot plate (~100 °C), and dry the residue at 105 °C for 30 min. The weight of the residue should not exceed 0.001 g.
Water [Part 2: Titrimetric Methods; Water by the Karl Fischer Method; Coulometric Procedure; Coulometric Procedure for Samples Using Karl Fischer Reagent, Method 2]. Use 1.0 mL (1.6 g) of the sample.
Ultraviolet Spectrophotometry Use the procedure in [Part 2: Chromatography; Recommended Procedures; LC Suitability; Procedure for Absorbance] to determine the absorbance.
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4259 ACS Reagent Chemicals, Part 4
